Kernel: Don't seek the program executable description in sys$execve()

The dynamic loader doesn't care if the kernel has moved the file
cursor around before it gains control.

Kernel/Syscalls/execve.cpp

@@ -527,8 +527,6 @@ KResult Process::do_exec(NonnullRefPtr<FileDescription> main_program_description
  });
 
  if (main_program_fd_allocation.has_value()) {
- auto seek_result = main_program_description->seek(0, SEEK_SET);
- VERIFY(!seek_result.is_error());
  main_program_description->set_readable(true);
  m_fds[main_program_fd_allocation->fd].set(move(main_program_description), FD_CLOEXEC);
  }